Micrometer-feed for tools.



' G. G. TREFETHEN. MIGROMETER FEED FOR TOOLS.

APPLIGATION FILED NOV. 5, 1910.

Patented July 1, 1913.

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theflsha shaft'and meshes the worm 8. The worm 8" is carried by the feed shaft 9. The shaft9' U STATES PATENT (anesthesia-gunman, or 1mm, rnnnsrnvanm- Assrenoa 'roroman r001.

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Specification of Letters: Patent.

- Patented July1,'1913.

application filed ltove nher 5, 1910. Serial No. 590,806.

THEN, aeitizen of they United States, resid-- ing at. Erie, in the. county of Erie and. State of Pennsylvania, have invented new and useful Improvements in Micrometer-Feeds= for Tools, of which the following is a'specification.

This invention relates'to micrometer feeds for tools; and consists in certain improvements in the. construction thereof as will be The inventionis particularly designed for use on grinding machines, and as shown, is

beingbroken awaytoshow the construction. Fig. 2-shows a side elevationof a part of a inding'machine, showingthe micrometer j eed. attachment. .Fig. .3 a section 'on' the 25 line 3-3 in Figs. 1 and 2. Fig. 4 a section on the line in Fig.3. Fig. 5 a section on the line 5-75 inFigs. 1 and 2.

1 marks 'theframe of the machine, 2 the sliding. table,f3 a portion of the cross feed frame, .4 a rack on said frame, 5 a gear meshingtthefrack 4. The gear 5 is fixed. on 6. The; gear 7 is also fixed on this is journaled in a: bearing 10, carried by'the frame,.and 1s locked against outward movement by the collar 10*. A collar 11 is fixed 7 0n the shaftfo'utside of the bearing 10, thus locking the shaft against endwise movement in theop osite direction.

A rate et wheel-112 is fixed on the cellar 11. The automatic feed of the shaft 9 is eifected through. this ratchet wheel. i The mechanism for feeding this is: as follows: A. ratchet arm 13 is-journaled on the collar 11, and carries the pawl 14, A spring 15 is secured to the arm 13, engages a pin 16 on the pawl, and pressesfthe pawl against the periphery of theiratchetwheel. The end of the spring is provided with a hook 17. It will be readily observed that when the pawl is thrown out to extreme position, the spring holds it in this outer position. On the other hand as shown in Fig. 2- the spring presses described and pointed out :Adock out device 32 i's eaijried by-a. head "by. an arm34 v pivoted on the frame by a stud 19. A link 20 connects the arm 13 with the lever 18. A lever 21 is journaled on the stud 21 on the frame. gage the screws 23-23 on the lever 1.8. It will he observed that ifthe lever 21 isroclred it will efiect the downward movement of the lever 18, and consequently, theildownward movement-of the pawl arm 13, t us moving the ratchet wheel forward so as to. rotate the shaft 9, and produce a feed movement. The lever 21 is connected b a link 24 with a lever 25.. The lever 25 is ournaled on the stud 26ca-rried by the frame- A gear. segment'27 .is fixed with the lever 25. The gear segment meshes-a. gear segment28 fixed on a shaft 30. The lever 29- is also fixed on the shaft 30, and. extends upwardly into the path of the adjustable stops 31 on the sliding table. Theshaft is connectedl'with the reverse. mechanism .(iiot shown). .which acts at the-ends ofthe stroke of'the. -table. The lever 29 is rockedwith it..andthrough themechanism, just described thQP WIarm 33. @Thehead 33 is car journaled on the shaftltj Thepurposeof the look-out device is .tofautomatically throw out the pawl 14 predetermined movement of the feed. Jhechanism has. been.

effected, sothat duplicate 'ieccs may be ground to size',fand",the. inac 'ne automatir call thrown out. of action -.when the piece reac es-thls pro-determined size. 'lhearm 34 has frictionalji'engagement with the ratchet wheel through the friction plug 35 which is held fin placein the socket 36. A

spring 37 is arranged; in the socket, and

presses theiplugg 4A screw 38 holds the spring-in the socket.

The head33 maybe locked ina fizged position, especially where .hand feeding is desired, by..meams of the swinging pawl 40, which can be swung into themotch 39 in the head. The pawl carried by a pin 41 on the bracket 42, and the bracket 42 is secured to theJframe of the machine.

i Thespace pawl 43 is carriedin the socket 44 in a head 33, and is designed to engage theiteeth'on the ratchet wheeL. Thepawl has/the stem 45 which extends through the head, and a spring 46 is arran ed in the socket 44, and presses the pawl 3' into en- It. has the arms- 2222 which en- I 55 it against the ratchet wheel. A lever 18'i's' V gagementwith the ratchet teeth. A button of which the pawl may be manually actuated.

A hand wheel 48 is fixed on the end of the shafti9. It has a rounded surface on it which can be conveniently grasped by the operator, and also has a scale flange 49 extending inwardly from the rim of the wheel. A pointer 50 is secured on the head 33, and is adjacent to the scale 49, so that the position of the scale relatively to the pointer, and consequently to the head 33, may be readily ascertained.

- The placing of the scale on the hand wheel is of great importance, because it places the scale out far enough to permit of an easy reading of it. To facilitate this, the flange 40 is tapered with the smaller end outwardly so that the upper part .of the flange is-approximately at right angles to the line of vision of the operator. By making the scale on the flange on the hand wheel, this convenience is attained, and at the same time the scale proper is not necessarily engaged by the hand of the operator, so as to in time dim the marking. The tapered surface of the flange also facilitates this, because if the operator should grasp the entire periphery of the wheel, including the flange, the scale surface would receive but little contact from the hand of the o erator. The scale 49 conforms to the rate et teeth, thatis, there are the same number of marks on the scale that there are ratchet teeth, or one of these is the multiple of the other. Where the lock out device is set for a 'ven diameter of the piece being ground, t e position of the head relatively to the scale can be readilyread, so that this size can be, with micrometer exactness, repeated. On the other hand, where it is desired to have hand feeding, the head 33 can be locked in a vertical position, and the movements of the hand wheel read by means of the scale. When the devices are used for hand feeding, the pawl 43 may be thrown out of engagement with the ratchet wheel and locked in this positionvby means of the pin 51 on the stem 45. This pin operates in a key slot 52, when the ratchet is locked in position in alinement with the path of the ratchet wheel. By lifting the pawl with a button 47 and turning it, the pm 51 is moved out of register with the key slot 'so as to lock the pawl in its outer position. I

What I claim as new is:

1. In a micrometer feed for tools, the combination of a feed shaft; a re .et wheel on said shaft; a hand wheel on. said shaft; a scale on the hand wheel, the graduations on which correspond to the graduations formed by the ratchet teeth;and a pointer adjacent to the scale.

- 2. In a micrometer feed for tools, the combination of a feed shaft; a ratchet wheel on said shaft; a hand wheel on the shaft, the wheel having a scale flange thereon; a scale on the flange, the graduations on which correspondto' the graduations formed by the ratchet teeth; and a pointer adjacent to the scale. 7

3. In a micrometer feed for tools, the combination of a feed shaft; a ratchet Wheel on said shaft; a hand wheel on said shaft, said wheel having a gripping rim thereon from the inner side face of which extends a scale flange, said flange being tapered with the smaller end attached next the wheel rim, said smaller end being of less diameter than said wheel rim; a scale on the flange, the graduations on which correspond to the graduations formed by the ratchet teeth; and a pointer adjacent to the scale.

4. In a micrometer feed for tools, the combination of a feedshaft; a ratchet wheel on said shaft; a ratchet pawl for operating the said wheel; automatic means for actuating the pawl; devices for locking the pawl; means for adjusting and locking said devices with relation to the ratchet Wheel; a hand Wheel on said shaft; a scale on the hand wheel the graduations on which correspond to the graduations formed by the ratchet teeth; and a pointer carried by said devicesand adjacent to the scale.

5. In a micrometer feed for tools, the combination of a feed shaft; a ratchet wheel on said shaft; a ratchet pawl for operating the said wheel; automatic means for actuating the pawl; devices for lockin the pawl; means for adjusting and locking said devices with relation to the ratchet wheel; a hand wheel fixed on said shaft, said hand wheel having a scale flange thereon, tapered 1 with the smaller end outward; a scale on the flange, the graduations on which correspond with the graduations formed by the ratchet teeth; and a pointer carried by said devices and adjacent to the. scale.

6. In a micrometer feed for tools, the combination of a frame; a feed shaft journaled thereon; a ratchet wheel on said shaft; a ratchet pawl; automatic means for actuating the ,pawl; devices for looking out the pawl; mechanism for adjusting and locking said devices with relation to the ratchet wheel; means for locking said devices with relation. to the frame; a hand wheel fixed on the shaft; a scale on the hand wheel havgraduations which correspond to the graduations formedby the ratchet teeth; and a pointer adjacent to thescale.

7 In "a micrometer feed for tools, the combination of a frame; a feed shaft journaled thereon; a ratchet Wheel on said shaft; a ratchet pawl; automatic meahs for ac tuati the 'awl; devices for locking out the paw mec anisni for adjustiiig and lockingsaid devices vvwith relation to the ratchet wheel; means for locking said devices with relation to the frame; a hand wheel fixed on the p In testimony whereof I have hereunto set shaft; a scale on the hand wheel having my hand in the presence of two subscribing graduations vwhich correspond to the graduwitnesses.

ations formed by. the ratchet teeth, app1i- I CHARLES G. TREFETHEN. 5 ances for locking out said devices when said Witnesses:

means are thrown out of action; and a C. D. HIGBY,

pointer adjacent to the scale. BLANGHE I'IARTMAN, 

